San Gregorio, CA Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from San Gregorio's primary NOAA station, SAN GREGORIO 2 SE.
The climate verdict for San Gregorio
A compact 11.5°F seasonal swing gives San Gregorio, California a steadier-than-extreme annual shape. NOAA reports an annual average of 55°F. It scores 77/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 70% of them.
- 55°F
- average temperature, NOAA 1991-2020 normal
- 77/100
- comfort score, above 70% of station-mapped location scores
- 30.4"
- yearly precipitation total
- 268 days
- growing season, frost-free days
San Gregorio: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00047807 · San Gregorio, CA 55°F mean · 30.4" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 55°F
- RANK-MID #4,048
- PHOTO-FINISH ≈ Half Moon Bay
- PRCP-MID 30.4"
- SWING-NARROW 12°F
- COMF-TOP 77/100
- LOAD-HEAT 3,722 HDD
- STN-1 USC00047807
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Half Moon Bay, CA (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every CA station list.
- Hot Mapleton, OR 56°F
- Near Scotia, CA 56°F
- San Gregorio (this station) 55°F
- Cold Haleakala Range…, HI 55°F
- Near Half Moon Bay, CA 55°F
Climate Living Index · San Gregorio
San Gregorio: 83/100 · grade B
San Gregorio publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for San Gregorio, not an official NOAA rating. Rankings still use Comfort Score 77/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Frost-free season | 268 days/year | 94/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Precipitation balance | 30.4 in · 4.6 from 35 in | 83/100 · B |
| Annual temperature balance | 54.8°F · 12.7° from 67.5°F | 59/100 · C |
San Gregorio · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
San Gregorio is a temperate Köppen climate: Csb
Coldest-month mean 49.5°F and warmest-month mean 61.0°F place this station in temperate, dry-summer, warm summer climates (Csb). Class Csb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, warm summer.
- Köppen code
- Csb
- Group
- Temperate
- Warmest month
- 61.0°F
- Coldest month
- 49.5°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where San Gregorio sits across the climate record
Three NOAA fields for San Gregorio's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 59th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 40th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 99%
- Warmest-to-coldest month gap for San Gregorio is compact versus 6,861 complete station-years.
How San Gregorio compares across U.S. station-mapped locations
San Gregorio's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
77 Top 30% score exceeds 70% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). This entry sits in this band.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 60°F (15°C) | 40°F (5°C) | 50°F (10°C) | 5.8" | 0.0" | 4.5 | 0.0 |
| February | 60°F (16°C) | 41°F (5°C) | 51°F (10°C) | 6.2" | 0.0" | 2.2 | 0.0 |
| March | 61°F (16°C) | 42°F (5°C) | 51°F (11°C) | 4.3" | 0.0" | 1.4 | 0.0 |
| April | 62°F (17°C) | 43°F (6°C) | 53°F (12°C) | 2.3" | 0.0" | 0.4 | 0.0 |
| May | 64°F (18°C) | 46°F (8°C) | 55°F (13°C) | 0.9" | 0.0" | 0.3 | 0.1 |
| June | 67°F (19°C) | 48°F (9°C) | 57°F (14°C) | 0.4" | 0.0" | 0.1 | 0.3 |
| July | 69°F (21°C) | 52°F (11°C) | 61°F (16°C) | 0.1" | 0.0" | 0.0 | 0.2 |
| August | 71°F (21°C) | 52°F (11°C) | 61°F (16°C) | 0.2" | 0.0" | 0.0 | 0.2 |
| September | 72°F (22°C) | 49°F (10°C) | 61°F (16°C) | 0.2" | 0.0" | 0.0 | 0.5 |
| October | 69°F (20°C) | 45°F (7°C) | 57°F (14°C) | 1.3" | 0.0" | 0.1 | 0.6 |
| November | 63°F (17°C) | 41°F (5°C) | 52°F (11°C) | 2.6" | 0.0" | 2.5 | 0.0 |
| December | 59°F (15°C) | 40°F (4°C) | 50°F (10°C) | 6.1" | 0.0" | 4.5 | 0.0 |
The year, day by day
The calendar barely moves in San Gregorio: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 40°F near December 12 and 72°F near September 10.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 40°F around December 12.
Where the wet dates fall
The likeliest wet date is February 18, when 47% of years recorded at least a hundredth of an inch. The driest is September 2 at 9%. Summed across the calendar, that is about 97 wet dates a year.
The widest day
October 4 carries the biggest normal gap between afternoon and dawn, 24°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for San Gregorio.
Monthly Precipitation
Average monthly rainfall and snowfall
13.5 days with precipitation
13.5 days with precipitation
11.8 days with precipitation
9.8 days with precipitation
6.3 days with precipitation
4.0 days with precipitation
2.8 days with precipitation
3.3 days with precipitation
2.6 days with precipitation
5.3 days with precipitation
10.3 days with precipitation
13.0 days with precipitation
San Gregorio's wet season runs through the cold months
December, January and February carry 59% of the year's precipitation here, while June through August contribute 2%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows an unusually narrow 11.5°F seasonal spread.
- Wettest month
- February, 6.2"
- Driest month
- July, 0.1"
- Wettest three months
- February, December, January (59% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
How San Gregorio's precipitation splits across the calendar
About 96 days a year record measurable precipitation here, carrying 30.4" between them, or roughly 0.32 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
San Gregorio's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
Frost Dates & Growing Season
First Fall Freeze
November 25
50% probability date
Last Spring Freeze
March 2
50% probability date
Growing Season
268 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
3,722
Higher = more heating needed
Cooling Degree Days
23
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside CA closest to San Gregorio on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (55°F here).
- Courtland, KS 55°F · 0.0°F off
- Cynthiana, KY 55°F · 0.0°F off
- Free Union, VA 55°F · 0.0°F off
- Greensburg, KS 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (30.4" here), excluding temperature-peer places.
- Fremont, NE 30.4" · 0.0" off
- David City, NE 30.4" · 0.0" off
- Port Hope, MI 30.4" · 0.0" off
- Florence, WI 30.4" · 0.0" off
Data-derived climate profile
How San Gregorio's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in San Gregorio, at 3,722 degree days versus 23 for cooling. Unlike a strongly continental record, however, its 11.5°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
The frost-free window extends for about 268 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
Temperature varies within a narrow 11.5°F band across the normal year. August and December mark the typical warm and cold ends of the calendar. The annual average is 55°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
San Gregorio's 30.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from San Gregorio's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for San Gregorio, not an official NOAA class or a year-ahead forecast.
Questions about San Gregorio's climate
How much rain does San Gregorio get? ▼
How much energy does heating and cooling require in San Gregorio? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from San Gregorio's primary station: SAN GREGORIO 2 SE (USC00047807). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for San Gregorio; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for San Gregorio comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.